Lost or corrupted `undo-tree' history

[Alexander Shukaev]

I'm sure some of you have already seen the new update to the `undo-tree' 
package which is supposed to fix the dreaded issue with either loss or 
corruption of undo history.  However, for those who don't know there is 
a great blog post with exhaustive analysis of the issue and how it must 
(allegedly) be resolved now with the new release [1].

A good read for anyone and especially experienced Emacs developers or 
power users who can suggest some improvements to the analysis and/or 
solution(s).  One point from my side about the corruption solution 
(which seems to not be set in stone yet as a final remedy, but rather a 
test release that would only show after some time whether the issue is 
truly gone), I believe the garbage collector can be temporarily disabled 
by simply wrapping the body of `undo-list-transfer-to-tree' into the 
following `let' form:

(let ((gc-cons-threshold most-positive-fixnum))
  ...)

Thoughts?

[1] http://www.dr-qubit.org/Lost_undo-tree_history.html